High-Strength DIN 6921 Hex Flange Bolt for Machinery and Construction

Short Description:

DIN 6921 flange bolts are a type of hexagonal head bolt manufactured to German standards. These bolts have an integrated flange and hexagonal head, providing excellent load distribution and vibration resistance. They are ideal for automotive, construction and heavy machinery applications and are available in different materials and surface finishes.

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DIN 6921 Hexagon Flange Bolts

DIN 6921 Hexagon Flange Bolt Dimensions

Thread size d		M5	M6	M8	M10	M12	(M14)	M16	M20
		-	-	M8 x 1	M10 x 1.25	M12 x 1.5	(M14x1.5)	M16 x 1.5	M20 x 1.5
		-	-	-	(M10 x 1)	(M10 x 1.25)	-	-	-
P		0.8	1	1.25	1.5	1.75	2	2	2.5
C	Min.	1	1.1	1.2	1.5	1.8	2.1	2.4	3
da	Min.	5	6	8	10	12	14	16	20
da	Max.	5.75	6.75	8.75	10.8	13	15.1	17.3	21.6
dc	Max.	11.8	14.2	17.9	21.8	26	29.9	34.5	42.8
dw	Min.	9.8	12.2	15.8	19.6	23.8	27.6	31.9	39.9
e	Min.	8.79	11.05	14.38	16.64	20.03	23.36	26.75	32.95
h	Max.	6.2	7.3	9.4	11.4	13.8	15.9	18.3	22.4
m	Min.	4.7	5.7	7.6	9.6	11.6	13.3	15.3	18.9
m´	Min.	2.2	3.1	4.5	5.5	6.7	7.8	9	11.1
s	Nominal size = max.	8	10	13	15	18	21	24	30
s	Min.	7.78	9.78	12.73	14.73	17.73	20.67	23.67	29.16
r	Max.	0.3	0.36	0.48	0.6	0.72	0.88	0.96	1.2

Parameters

● Standard：DIN 6921
● Material：Carbon Steel, Stainless Steel (A2, A4), Alloy Steel
● Surface Finish：Zinc Plated, Galvanized, Black Oxide
● Thread Type：Metric (M5-M20)
● Thread Pitch：Coarse and Fine Threads Available
● Flange Type：Smooth or Serrated (Anti-Slip Option)
● Head Type：Hexagon
● Strength Grade：8.8, 10.9, 12.9 (ISO 898-1 compliant)

Features

● Integrated Flange Design: Ensures even load distribution, reducing the risk of damage to connected surfaces.
● Serrated Flange Option: Provides extra grip and prevents loosening under vibration.
● Corrosion Resistance: Surface treatments like zinc plating or galvanization ensure long-lasting performance.